In autumn, greenhouse vegetables begin to be planted. After the "rest" during the summer shelter period, many farmers tend to relax the management of greenhouse vegetables in early autumn, which often leads to the phenomenon of wilting seedlings of autumn vegetables after planting. At the same time, affected by the high temperature in summer, the current greenhouse temperature is still relatively high, and vegetables require a large amount of water, and water should be provided for vegetable growth based on actual conditions. The autumn management of greenhouse vegetables is very important and plays a key role in the entire growth period. Therefore, strengthening the autumn management of greenhouse vegetables cannot be ignored.
If you want to grow autumn shed vegetables, first look at "Three Attentions"
Pay attention to increasing the amount of organic fertilizer and biological fertilizer. Before planting vegetables, pay attention to increase the amount of organic fertilizer and apply organic fertilizer deeply. Its purpose is to increase the content of organic matter in the soil, promote the formation of soil aggregate structure, and increase soil permeability. In addition, pay attention to increasing the amount of biological fertilizer. Biological bacterial fertilizer can increase the number of beneficial microorganisms in the soil, inhibit the occurrence of soil-borne diseases, and at the same time promote rooting, which is conducive to the formation of strong trees for vegetables and increases the yield in the later stage.
Pay attention to reducing the amount of fertilizer. When the first crop is planted in the large arch shed, more organic fertilizers are often used, and the amount of fertilizer used in the later period is larger, which determines that when the planting of vegetables in the large arch shed is delayed in autumn, the amount of chemical fertilizer is minimized. In hot weather, the solubility of chemical fertilizers in the soil is very high, coupled with the high salt content in the soil itself, excessive application of chemical fertilizers is not conducive to root growth.
Be careful not to cover the whole shed with black mulch. The environmental conditions in late summer and early autumn are not only good for vegetables but also for the growth of weeds. In order to prevent weeds between rows, some vegetable farmers covered black mulch after planting, which could easily cause the temperature under the mulch to be too high. A large amount of water vapor would volatilize from the base of the stem, burn the base of the vegetable stem, and create opportunities for pathogen infection. Therefore, if laying black mulch film should not connect them, keep a certain distance from the base of the plant stem, and press around the stem. If the temperature in the shed is too high, it is not recommended for vegetable growers to cover with mulch, and they can cover with mulch after the high temperature (after the heat).
After planting shed vegetables, management is the first
Planting vegetables to prevent wilting. After planting, flooding or watering will encounter continuous cloudy days, the soil water content is too high, the air permeability is poor, the roots of the plants are difficult to breathe, and harmful substances such as ethanol produced during anaerobic respiration accumulate and damage the roots, resulting in plant wilting. It is recommended that vegetable growers cultivate in ridges and avoid furrow or border planting; flood irrigation should be avoided when watering, and no stagnant water should appear; hoeing frequently to increase soil permeability. As for the wilting of plants caused by fertilizer damage, it can be relieved by watering and pressing salt immediately and flushing with biological fertilizer.
Hormone concentration should be adjusted well. For example, when the vegetables are growing, try to adjust the temperature, fertilizer and water as much as possible, while spraying the strong hormone is only a countermeasure when it is difficult to control; another example is when the vegetables fall flowers and fruits, it is often caused by temperature discomfort and unregulated fertilizer and water. Find out the cause in time. Take corresponding measures.
Beware of viruses entering the shed. High-temperature and high-humidity pests are prone to multiplying in large numbers. Anti-insect nets should be set up at the air outlet of the greenhouse to prevent whitefly, aphids, spider mites and other pests from flying in and spreading viruses. Once pests such as whitefly, spider mites and aphids are found, use 3% acetamiprid EC 1500 times and 10% imidacloprid wettable powder 2000 times for control in time. Once infected with the virus, use Mission Bida and Hirudin for prevention and treatment, and spray twice.
Vegetables need to be watered
Planting water varies from time to time. In summer and autumn, the temperature is high, and seedlings are usually transplanted in the afternoon or evening. After the planting is completed, watering should be followed. If it is not thoroughly watered, watering can be done the next morning. Planting when the temperature is low, you need to pay attention to weather changes at any time, generally choose to transplant in the morning after severe weather. Usually watering should choose cold tail warm head period.
The specific time for watering should be "three-sighted". First, judge the water demand by looking at the growth of the plants. For example, when the cucumber growth points are shrunk into a ball, the stems are looped and not stretched, and the leaves are dark green, the melon strips are dull, and the pointed ends, it means that the plant has symptoms of water shortage; secondly, look at the degree of soil dryness. Ensure that the soil sees dry and wet, and proper water control is the main focus in the early stage of growth, and the roots are pierced. After entering the fruiting period, the plant needs a large amount of water and fertilizer, and the frequency of watering should be increased. However, it is necessary to water frequently with small water to avoid large changes in soil moisture and fruit cracking; again, it depends on the weather. It is necessary to pay attention to the weather changes in time. Do not water before the rainy day. Choose to water in the morning on a sunny day to reduce the excessive humidity at night caused by watering in the afternoon. After watering the same day, increase ventilation the next day and reduce the humidity in the shed as soon as possible.
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